For Kuryakyn trailer wiring harness Plugs in & allows our Wiring & Relay Kits to power trailers requiring a 4-wire harness (run, left turn/brake, right turn/brake, ground). The bonus wire is still available to provide fused 12v power to the trailer for compartment lights or keyless entry systems that are wired independently of the trailers essential lighting. (Includes 4-pin flat vehicle connector)
